EP1635090B1 - Ölabsaugeeinrichtung - Google Patents

Ölabsaugeeinrichtung Download PDF

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Publication number
EP1635090B1
EP1635090B1 EP05255507A EP05255507A EP1635090B1 EP 1635090 B1 EP1635090 B1 EP 1635090B1 EP 05255507 A EP05255507 A EP 05255507A EP 05255507 A EP05255507 A EP 05255507A EP 1635090 B1 EP1635090 B1 EP 1635090B1
Authority
EP
European Patent Office
Prior art keywords
oil
rotating body
baffle plate
oil discharge
final gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05255507A
Other languages
English (en)
French (fr)
Other versions
EP1635090A2 (de
EP1635090A3 (de
Inventor
Hiromi Taguchi
Hitoshi Suzuki
Katsuyoshi Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JATCO Ltd
Original Assignee
JATCO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JATCO Ltd filed Critical JATCO Ltd
Publication of EP1635090A2 publication Critical patent/EP1635090A2/de
Publication of EP1635090A3 publication Critical patent/EP1635090A3/de
Application granted granted Critical
Publication of EP1635090B1 publication Critical patent/EP1635090B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0482—Gearings with gears having orbital motion
    • F16H57/0483—Axle or inter-axle differentials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0423—Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19991—Lubrication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2186—Gear casings
    • Y10T74/2188—Axle and torque tubes

Definitions

  • the present invention relates to an oil discharge structure in accordance with the preamble of claim 1.
  • the baffle plate separates a space of a gear side from a space of a transmission case side (an oil-storing side) by surrounding a circumference of the gear placed in oil, thereby reducing an amount of the oil stirred by the gear.
  • An inlet/outlet hole is formed in a lower part of the baffle plate to connect the space of the gear side to the space of the transmission case side so that unnecessary oil stirred by the gear is discharged to the space of the transmission case side.
  • an oil discharge structure includes a transmission case surrounding a rotating body in a rotating body chamber, an oil reservoir to store oil discharged from the rotating body chamber, an oil discharge path from the rotating body chamber to the oil reservoir, and a baffle plate placed between the transmission case and the rotating body in the rotating body chamber to surround a lower part of the rotating body, so that the oil in a circumference of the rotating body is divided into a rotating body side and a transmission case side in the rotating body chamber, wherein the baffle plate includes an oil discharge hole facing a side face of the rotating body, and the oil discharge hole facing an opening of the oil discharge path at a side of the rotating body chamber, which permits the oil in the rotating body side divided by the baffle plate to be discharged from the oil discharge hole to the oil discharge path.
  • the baffle plate surrounds the lower part of the rotating body, an amount of oil to be stirred by the rotating body is reduced, thereby allowing a reduction in a friction loss of the rotating body.
  • the oil discharge hole is formed in a position facing a side face of the rotating body, no space for oil flow is needed in a lower part of the transmission case.
  • an automatic transmission in a smaller size in a radial direction of the rotating body can be provided as compared to a case where the oil discharge hole is formed in a lower part of the baffle plate.
  • the oil discharge hole and the opening of the oil discharge path are adapted to be positioned as opposed to each other, the oil in the rotating body side can be actively discharged to a side of the oil discharge path, which prevents an oil shortage in the oil reservoir from occurring.
  • Fig. 1 is a front view showing a final gear of an automatic transmission seen from a housing side and Fig. 2 is a cross-sectional view showing a differential unit of the automatic transmission.
  • the power transmitted to the input shaft 2, after rotation speeds of the input shaft 2 are converted through a transmission unit including a primary pulley 3 connected to the input shaft 2, a secondary pulley 4 fixed to a secondary shaft and a V-shaped belt (not shown) wound between both the pulleys 3 and 4, transmitted to a reduction gear 5.
  • a transmission unit including a primary pulley 3 connected to the input shaft 2, a secondary pulley 4 fixed to a secondary shaft and a V-shaped belt (not shown) wound between both the pulleys 3 and 4, transmitted to a reduction gear 5.
  • the reduction gear 5 engages with a final gear 6 of a differential unit 8 to transmit the power to the differential unit 8 from the reduction gear 5.
  • the power transmitted to the differential unit 8 is transmitted to driving wheels (not shown) of a vehicle, thus driving the vehicle.
  • Oil is stored to an oil level "W" in a transmission case 50 and generally one half of the final gear 6 is immersed in the oil.
  • An oil pan 10 is mounted in a lower part of the transmission case 50.
  • An oil strainer 11 is placed in the lower part of the transmission case 50, through which an oil pump (not shown) sucks up the stored oil in the oil pan 10.
  • the transmission case 50 includes a case supporting wall 52 to support one end of each of the input shaft 2, the secondary shaft, the reduction gear 5 and the differential unit 8, and a case side connecting section 51 extending from an outer peripheral edge of the case supporting wall 52 toward the front side in Fig. 1 .
  • each of the input shaft 2, the secondary shaft, the reduction gear 5 and the differential unit 8 is, as specifically shown in Fig. 2 , supported by a housing support section 62 of a housing 60 connected to the engine.
  • a housing connection section 61 extends from an outer peripheral edge of the housing support section 62.
  • the case supporting wall 52 of the transmission case 50 is joined to the housing support section 62 of the housing 60 by a bolt (not shown) to house therein the transmission unit including the primary pulley 3 and the secondary pulley 4, the reduction gear 5, and the differential unit 8.
  • the differential unit 8 is housed in a rotating body chamber 55 surrounded and defined by the transmission case 50 and the housing 60.
  • a fan-shaped case side baffle plate 20 is placed at a side of the final gear 6, between the final gear 6 and the case supporting wall 52 and fixed by bolts 28 to the case supporting wall 52.
  • a housing side baffle plate 30 is placed between the final gear 6 and the housing support section 62 and fixed by bolts 38 to the housing support section 62.
  • the bolts 28 and 38 are screwed from the side of the final gear 6, respectively.
  • the case side baffle plate 20 includes a side face plate 25 covering a side face of the final gear 6, and a tooth face plate 26 extending from a fan-shaped external edge of the side face plate 25 to the side of the final gear 6.
  • the housing side baffle plate 30 includes a side face plate 35 covering a side face of the final gear 6, and a tooth face plate 36 extending from a fan-shaped external edge of the side face plate 35 to the side of the final gear 6.
  • a tooth surface of the final gear 6 is covered by the tooth face plate 26 of the case side baffle plate 20 and the tooth face plate 36 of the housing side baffle plate 30.
  • an oil volume X (oil as a volume) in the circumference of the final gear 6 in which the final gear 6 receives an oil stir resistance during the rotating and an oil volume Y in the sides of the transmission case 50 and the housing 60 (oil as a volume stored in a clearance between the case side baffle plate 20 and the transmission case 50, and in a clearance between the housing side baffle plate 30 and the housing 60) are separated.
  • rotation of the final gear 6 causes an oil flow in the oil volume X to be produced in the same direction with the rotation of the final gear 6.
  • the case side baffle plate 20 includes a lubricating oil guide 21 formed at an end of an outlet side of the final gear 6 (a side where the rotating final gear 6 goes out the case side baffle plate 20) when the vehicle runs forwards and an oil discharge guide 22 formed at an end of an inlet side of the final gear 6 (a side where the rotating final gear 6 comes into the case side baffle plate 20) when the vehicle runs forwards.
  • the lubricating oil guide 21 extends to the vicinity of an engagement section between the reduction gear 5 and the final gear 6, thereby acting as a supplying guide so as to supply the oil stirred up by the final gear 6 to the engagement section.
  • the housing side baffle plate 30 includes a lubricating oil guide formed at an end of an outlet side of the final gear 6 when the vehicle runs forwards, thereby to guide the oil stirred up by the final gear 6.
  • the oil stirred up by the final gear 6 is supplied to the engagement section between the reduction gear 5 and the final gear 6 as lubricating oil necessary for gear lubrication without dropping downward.
  • a slit 40 is formed in the oil discharge guide 22 to connect the oil volume X to the oil volume Y.
  • the oil discharge guide 22 acts as such a guide that the oil in the oil volume X flowing in the same direction with rotation of the final gear 6 is led to the slit 40.
  • the housing side baffle plate 30 includes the lubricating oil guide formed at the end of the inlet side of the final gear 6 when the vehicle runs forwards and a slit 45 is, as specifically shown in Fig. 2 , formed in the lubricating oil guide.
  • the lubricating oil guide of the housing side baffle plate 30 acts as such a guide that the oil of the oil volume X flowing in the same direction with rotation of the final gear 6 is led to the slit 45.
  • Fig. 3 is a cross-sectional view taken on line A - A in Fig. 1 .
  • a cut line of a predetermined length is formed from the connecting section with the tooth face plate 26 toward an inward side of the fan-shaped side face plate 25.
  • a jetty section 41 is formed by protruding a downstream part of the cut line in relation to an oil flowing direction around the final gear 6, toward a side of the final gear 6, thereby forming the slit 40.
  • an opening of the slit 40 faces to an inlet side of the final gear 6 coming into the case side baffle plate 20.
  • An oil drain hole 70 is formed in the case supporting wall 52 of the transmission case 50 at a position as opposed to the slit 40.
  • the space at the left side of the case supporting wall 52 shown in Fig. 3 is connected to the oil pan 10 mounted to the bottom part of the transmission case 50 (back side in Fig. 3 )
  • the oil flowing in the oil volume X in the direction of an arrow 100 caused by rotation of the final gear 6 is divided into the oil flowing in the direction of an arrow 101 and the oil flowing in the direction of an arrow 102 by the slit 40.
  • the oil flowing in the oil volume X in the direction of the arrow 102 serves as a lubricating oil for both the final gear 6 and the reduction gear 5.
  • the oil flowing in the direction of the arrow 101, namely from the oil volume X to the oil volume Y is a drain oil that does not lubricate the final gear 6 or the reduction gear 5.
  • the oil flowing in the direction of the arrow 101 is divided into the oil flowing in the direction of arrow 104 into the oil volume Y and the oil flowing in the direction of arrow 103 into the oil drain hole 70.
  • the oil flowing in the direction of arrow 104 is separated from that flowing in the direction of arrow 102 by the rotation of the final gear 6, and is stored in the oil volume Y.
  • the oil drain hole 70 formed in the case supporting wall 52 is located at a position lower than the oil level "W" of the stored oil in the transmission case 50, the oil stored in the oil volume Y flows from the oil drain hole 70 to the oil pan 10.
  • the oil flowing in the direction of the arrow 103 is actively supplied to the oil drain hole 70 and then flows to the oil pan 10 in the lower side in Fig. 1 to be collected around the oil strainer 11.
  • an oil drain hole communicated with the oil pan 10 is formed at a position as opposed to the slit 45 of a housing support section 62.
  • the slit 45 as well as the slit 40 actively supply the oil in the oil volume X to the side of the oil drain hole located in the housing support section 62.
  • the final gear 6 corresponds to a rotating body
  • both the transmission case 50 and the housing 60 correspond to a transmission case
  • the oil pan 10 corresponds to an oil reservoir
  • each of the slits 40 and 45 corresponds to an oil discharge hole.
  • the path from the oil drain hole 70 to the oil pan 10 provided in a back side in Fig. 3 corresponds to an oil discharge path.
  • the preferred embodiment is constructed as described above, whereby both the case side baffle plate 20 and the housing side baffle plate 30 surround the part of the final gear 6 immersed in the oil to divide the space between the final gear 6 and the transmission case 50 into the oil volume X and the oil volume Y, so that the final gear 6 is allowed to stir only the oil in the oil volume X and an amount of the oil to be stirred is reduced. Thereby a friction loss of the final gear 6 can be reduced.
  • the slit 40 and the oil drain hole 70 are positioned as opposed to each other and still further the slit 45 and the oil discharge hole provided in the housing support section 62 are positioned as opposed to each other, whereby the oil in the oil volume X can be actively drained through the oil drain hole 70 to the oil pan 10. This prevents an oil shortage in the oil pan 10, and thus. It is avoided that the oil strainer 11 sucks in air.
  • Both ends of the case side baffle plate 20 and the housing side baffle plate 30 in the outlet side of the final gear 6 are extended to the vicinity of the engagement section between the reduction gear 5 located over final gear 6 and the final gear 6.
  • the slits 40 and 45 each are formed in the vicinity of the ends of the case side baffle plate 20 and the housing side baffle plate 30 at the inlet side of the final gear 6, the oil in the oil volume X to be stirred by the final gear 6 can be discharged to the oil volume Y at earlier timing. This reduces an amount of the oil to be stirred by the final gear 6, thereby allowing a reduction in a friction loss thereof.
  • the slit 40 Since the jetty section 41 is protruded toward the side of the final gear 6, the slit 40, of which opening is facing the inlet side of the final gear 6, is formed in the case side baffle plate 20. This provides a back flow prevention structure in which the slit 40 prevents reverse flow of the oil from the oil volume Y to the oil volume X.
  • the slit 45 also forms a back flow prevention structure in the same way with the slit 40 and achieves the same effect as the slit 40.
  • the jetty section 41 of the case side baffle plate 20 is protruded toward the side of the final gear 6 to form the slit 40, so that the oil around the final gear 6 can be removed by the slit 40.
  • a slit 40A may be formed by protruding a upstream part of the cut line formed in the side face plate 25A of the case side baffle plate 20A in relation to an oil flowing direction around the final gear 6, backward the side of the final gear 6.
  • an opening of the slit 40A faces the outlet side of the final gear 6 going out from the baffle plate 20A on the case side.
  • the slit 40A in this case also forms a back flow prevention structure in which reverse flow of the oil from the oil volume Y to the oil volume X can be prevented.
  • the slit 45 may be formed with its opening facing the outlet side of the final gear 6 going out from the housing side baffle plate 30 in the same way with the slit 40.
  • the slit 45 is also adapted to form the back flow prevention structure in the same way with the slit 40.
  • the slit 40 provided in the side face plate 25 of the case side baffle plate 20 and the slit 45 provided in the side face plate 35 of the housing side baffle plate 30 may be holes formed in the side face plates 25 and 35.
  • the oil discharge from the oil volume X to the oil volume Y can be performed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)

Claims (5)

  1. Ölableitungsstruktur, die Folgendes umfasst:
    ein Getriebegehäuse (50, 60), das einen Drehkörper (6) in einer Drehkörperkammer (55) umschließt,
    einen Ölbehälter zum Speichern von aus der Drehkörperkammer abgeleitetem Öl,
    eine Ölableitungsbahn von der Drehkörperkammer zu dem Ölbehälter und
    eine Ablenkplatte (20, 30), die zwischen dem Getriebegehäuse und dem Drehkörper in der Drehkörperkammer angeordnet ist, um einen unteren Teil des Drehkörpers zu umschließen, so dass das Öl im Umfang des Drehkörpers in eine Drehkörperseite und eine Getriebegehäuseseite in der Drehkörperkammer geteilt wird, dadurch gekennzeichnet, dass:
    die Ablenkplatte ein Ölableitungsloch (40, 45) einschließt, das einer Seitenfläche des Drehkörpers gegenüberliegt, und
    das Ölableitungsloch einer Öffnung (70) der Ölableitungsbahn an einer Seite der Drehkörperkammer gegenüberliegt, so dass das durch die Ablenkplatte geteilte Öl durch das Ölableitungsloch in der Drehkörperseite zu der Ölableitungsbahn abgeleitet wird.
  2. Ölableitungsstruktur nach Anspruch 1, wobei:
    ein Ende der Ablenkplatte (20, 30) an einer Auslass-Seite des Drehkörpers (6) den Drehkörper bis zu einem oberen Teil desselben umschließt.
  3. Ölableitungsstruktur nach Anspruch 1 oder 2, wobei:
    das Ölableitungsloch (40, 45) in der Nachbarschaft eines Endes der Ablenkplatte (20, 30) an einer Einlass-Seite des Drehkörpers (6) geformt ist.
  4. Ölableitungsstruktur nach einem der Ansprüche 1 bis 3, wobei:
    das Ölableitungsloch einen Schlitz (40, 45), der an einer Seite des Drehkörpers (6) geformt ist, wobei eine Öffnung desselben der Einlass-Seite des Drehkörpers gegenüberliegt, oder einen Schlitz (40A), der an einer Seite des Getriebegehäuses (50, 60) geformt ist, wobei eine Öffnung desselben der Auslass-Seite des Drehkörpers gegenüberliegt, umfasst.
  5. Ölableitungsstruktur nach einem der Ansprüche 1 bis 3, wobei:
    die Ablenkplatte (20, 30) durch Schrauben (28, 38) an dem Getriebegehäuse (50, 60) befestigt ist, die von der Seite des Drehkörpers (6) aus eingeschraubt sind, und
    das Ölableitungsloch ein Schlitz (40, 45) ist, der zu der Drehkörperkammer (55) hin verschoben ist, so dass eine Öffnung desselben der Einlass-Seite des Drehkörpers gegenüberliegt.
EP05255507A 2004-09-09 2005-09-08 Ölabsaugeeinrichtung Expired - Fee Related EP1635090B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004262856A JP4074278B2 (ja) 2004-09-09 2004-09-09 バッフルプレート排油構造

Publications (3)

Publication Number Publication Date
EP1635090A2 EP1635090A2 (de) 2006-03-15
EP1635090A3 EP1635090A3 (de) 2010-05-19
EP1635090B1 true EP1635090B1 (de) 2011-05-11

Family

ID=35448210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05255507A Expired - Fee Related EP1635090B1 (de) 2004-09-09 2005-09-08 Ölabsaugeeinrichtung

Country Status (3)

Country Link
US (1) US7984791B2 (de)
EP (1) EP1635090B1 (de)
JP (1) JP4074278B2 (de)

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US7984791B2 (en) 2011-07-26
EP1635090A3 (de) 2010-05-19
US20060048600A1 (en) 2006-03-09
JP2006077894A (ja) 2006-03-23
JP4074278B2 (ja) 2008-04-09

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